Assets in the nation's money market mutual funds stood at $736.7 billion as of Sept. 13, only $200 million more than a week earlier.

Assets of the nation's 691 retail money market funds increased by $476.5 million, to $516.8 billion, according to the Investment Company Institute, the Washington-based trade group that represents the mutual fund industry.

Meanwhile, assets of the 300 institutional funds declined by $260.7 million, to $219.91 billion.

Assets in taxable retail funds rose by $828.9 million, to $415.97 billion. Assets in tax-exempt retail funds declined by $352.4 million, to $100.83 billion.

Meanwhile, assets in taxable institutional funds grew by $429.8 million, to $195.43 billion, and assets in tax-free institutional funds fell by $690.5 million, to $24.48 billion.

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